Plant availability and uptake of molybdenum as influenced by soil type and competing ions
Laboratory and greenhouse experiments were conducted to evaluate the influence of competing ions in the soil solution on the relationship between the sorption of Mo by soils and Mo uptake by grass. Laboratory experiments assessed Mo sorption by Edroy clay, Olmos loamy sand, and Randado sandy loam. Soil treatments included 1, 5, 10, 20, 50, and 100 mg Mo L/sup -1/ added as ammonium molybdate in solutions of 0, 167, 333, and 500 mg L/sup -1/ concentrations of Cl/sup -/ and 0, 226, 451, and 677 mg L/sup -1/ concentrations of SO/sub 4//sup 2 -/ salts. Sorption data fit the Freundlich isotherm. The Olmos soil had the highest CaCO/sub 3/ content and sorbed the most Mo. The Edroy soil had the lowest pH and sorbed the least Mo. The presence of Cl/sup -/ in solution increased Mo sorption, while SO/sub 4//sup 2 -/ reduced Mo sorption in all three soils. In the greenhouse study, soils were treated with 0, 6.5, 13.0, and 26.0 mg Mo kg/sup -1/ soil; 167, 334, and 501 mg Cl kg/sup -1/ soil; and cropped with bermuda grass, Cynodon dactylon (L.)Pers. No toxic symptoms or yield decreases were noted as a result of Mo or salt additions. Plants grown in soil containing 26.0 mg Mo kg/sup -1/ accumulated up to 600 mg Mo kg/sup -1/ dry matter and would be toxic to ruminants. The Mo concentrations in grass grown on the three soils were ranked from highest to lowest as Edroy > Randado > Olmos. Chloride addition to the soil had no significant (P <0.05) effect on bermuda grass Mo content.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 5504173
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 16:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
GRASS
PRODUCTIVITY
MOLYBDENUM
BIOLOGICAL AVAILABILITY
ECOLOGICAL CONCENTRATION
UPTAKE
SOILS
SORPTIVE PROPERTIES
CHLORIDES
PH VALUE
SULFATES
CHLORINE COMPOUNDS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
METALS
OXYGEN COMPOUNDS
PLANTS
SULFUR COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENTS
560300* - Chemicals Metabolism & Toxicology
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)